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G <br />4i4ac4�.-1 , Y,tc. <br />p R„ M Ruse.. r t <br />------- ------ C'°N--.''ili'"f G'tg'"�e'_' - --- -� IJIuMM 0 4 ed.,m. P L <br />1335 iv. 7.—A .Y,�. a, 36 --- -- R,rdl,•,d re ( re.Arq. P f <br />Al.. Aa•dI lr,v,. Pf <br />SI n�rf, Af------•- 33113 /amr, (' (H,on. P I <br />P"_ 6f2.636-4600 <br />June 20, 1985 <br />City of Orono <br />Box 66 <br />Crystal Bay, MN 55323 <br />Attn: Ms. Jeanne Mabusth <br />Re: File No. 139 <br />Wetland Alterations <br />Dear Jeanne, <br />@E JLt <br />0 <br />'J <br />CI: i <br />TY or opor�o <br />(.lree R (I ... A. P I <br />Aral A (.ordure, P 1,rAume E hoy0. f E <br />RrAe,d N fu„r,, rf <br />R..Ar„ 6 S,AurereAt. Pt <br />Ma,.m L 5,. sle. I' I <br />D—ald ( Ro,,e,d,. P I. <br />Ir,.. A Rowdun. P L <br />Me,* A Nae,on. P I <br />red A I wld P I- <br />MwAae/ r Rw,re.arere. P f <br />Ruben R. Pfeffealr. P E <br />f o.w 0 100 ,1#. P t' <br />L'Aer, A t,re A,on <br />I.eu 4f-PI,.rUA. <br />Na,Aare .N 060re <br />The purpose of this letter is to develop criteria for staff to utilize in the <br />review of wetland alternation applications. The city has received several re- <br />quests over the past two years for developing wildlife and/or decorative <br />ponds. The alternation of wetlands raises two primary environmental concerns; <br />water quality change and water quantity change; and the ultimate effect on <br />Lake Minnetonka. <br />There has been a great deal of information g,•(•ated on water quality and the <br />quantity of runoff. We would like to utilize that information which is con- <br />sistent with the Orono philosophy for protecting Lake Minnetonka. The exi::t- <br />ing City ordinance provides for a conditional use permit for dredging or exca- <br />vating of material from any lake bed, or wetland or land adjacent thereto. <br />The major items which should be addressed in reviewing the Land Alteration <br />Application are water quality, water quantity, construction procedures and <br />purpose of alteration. <br />Water quality <br />1. Type of wetland <br />2. Assimilative capacity of each type of wetland <br />3. Time of year alteration to be completed <br />4. Stagnant water potential <br />5. Algae. control <br />6. Design configuration of alternation <br />7. Monitoring procedures <br />Water Quantity <br />1. Design storm return frequency (100 year) <br />2. Overflow control device <br />3. Watersh-d characteristics <br />4. Retention time <br />Page 1. <br />8662c <br />